<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>分类参数</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片区域 -->
        <el-card>
            <!-- 警示语 -->
            <el-alert show-icon title="注意：只允许为第三段分类设置相关参数！" type="warning" :closable="false"></el-alert>
            <!-- 选择商品区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类:</span>
                    <!-- 选择商品分类的级联选择框 -->
                    <el-cascader v-model="selectedCatKeys" :options="catelist" :props="cateProps" @change="handleChange" clearable></el-cascader>
                </el-col>
            </el-row>
            <!-- tab 页签区域 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 添加动态阐述的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
                    <!-- 动态参数表格 -->
                    <el-table :data="manyTableData" border stripe="">
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染tab标签 -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                                <!-- 输入文本框 -->
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)"></el-input>
                                <!-- 按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编 辑</el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <el-tab-pane label="静态属性" name="only">
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
                    <!-- 静态参数表格 -->
                    <el-table :data="onlyTableData" border stripe="">
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染tab标签 -->
                                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">{{item}}</el-tag>
                                <!-- 输入文本框 -->
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)"></el-input>
                                <!-- 按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编 辑</el-button>
                                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>
        <!-- 添加参数的对话弹出框 -->
        <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
            <!-- form表单 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>
        <!-- 修改参数的对话弹出框 -->
        <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
            <!-- form表单 -->
            <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
                <el-form-item :label="titleText" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>
<script>
export default {
    data () {
        return {
            // 商品列表
            catelist :[],
            // 级联选择框的配置对象
            cateProps:{
                expandTrigger: 'hover', // 选下级时是点击选择还是经过选择
                value:'cat_id',      //商品id
                label:'cat_name',    // 商品显示名称
                children:'children'  // 子级
            },
            // 级联选择框双向绑定到的数组
            selectedCatKeys:[],
            // 页签区域默认显示
            activeName:'many',
            // 动态数据
            manyTableData:[],
            // 静态数据源
            onlyTableData:[],
            // 添加参数弹出对话框的显示和隐藏
            addDialogVisible:false,
            // 添加参数的表单数据对象
            addForm:{
                attr_name:''
            },
            // 添加表单的验证规则对象
            addFormRules:{
                attr_name:[
                    { required:true, message: '请输入参数名称', trigger:'blur' }
                ]
            },
            // 修改参数的对话框的显示与隐藏
            editDialogVisible:false,
            // 修改参数的表单数据对象
            editForm:{
                attr_name:''
            },
            // 修改表单的验证规则对象
            editFormRules:{
                attr_name:[
                    { required:true, message: '请输入参数名称', trigger:'blur' }
                ]
            }
        }
    },
    created () {    
        this.getCateList()
    },
    methods:{
        // 获取所有的商品分类
        async getCateList () {
            const { data:res } = await this.$http.get('categories')
            if (res.meta.status !== 200) {
                return this.$message.error('获取商品分类失败！')
            }
            this.catelist = res.data
            console.log(this.catelist);
        },
        // 级联选择框选中项变化，会触发这个函数
        async handleChange() {
            this.getParamsData()
        },
        // tab 页签点击事件的处理函数
        handleTabClick () {
            console.log(this.activeName);
            this.getParamsData()
        },
        // 获取参数的列表数据
        async getParamsData(){
            // 证明选中的不是三级分类
            if (this.selectedCatKeys.length !== 3 ){
                this.selectedCatKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return
            }
            // 证明选中的是三级分类s


            
            console.log(this.selectedCatKeys);
            // 根据所选分类的Id，和当前所处的面板，获取对应的参数
            const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{ sel: this.activeName }})
            if(res.meta.status !== 200 ){
                return this.$message.error('获取参数列表失败！')
            }
            console.log(res.data);
            //  遍历切验证一下是否有
            res.data.forEach(item => {  
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ')  : []
                // 控制文本框的显示与隐藏
                item.inputVisible = false
                // 文本框中输入的值
                item.inputValue = ''
            })
            if (this.activeName === 'many') {
                this.manyTableData = res.data
            } else{
                this.onlyTableData = res.data
            }
        },
        // 监听添加对话框的关闭事件
        addDialogClosed() {
            this.$refs.addFormRef.resetFields()
        },
        // 点击按钮，添加参数
        addParams() {
            this.$refs.addFormRef.validate(async valid =>{
                if(!valid) return
                const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
                    attr_name: this.addForm.attr_name,
                    attr_sel: this.activeName
                })
                if(res.meta.status !== 201) {
                    return this.$message.error('添加参数失败！')
                }
                this.$message.success('添加参数成功！')
                this.addDialogVisible = false
                this.getParamsData()
            })
        },
        // 监听修改对话框的关闭事件
        editDialogClosed() {
            this.$refs.editFormRef.resetFields()
        },
        // 获取需要修改的数据
        async showEditDialog(attr_id) {
            const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{params: { attr_sel:this.activeName }})
            if(res.meta.status !== 200) {
                return this.$message.error('获取参数信息失败！')
            }
            this.editForm = res.data
            this.editDialogVisible = true
        },
        // 点击按钮，修改数据
        editParams (){
            this.$refs.editFormRef.validate(async valid => {
                if(!valid) return
                const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                    attr_name:this.editForm.attr_name,
                    attr_sel:this.activeName
                })
                if(res.meta.status !== 200){
                    return this.$message.error('修改参数失败！')
                }
                this.$message.success('修改成功！')
                this.getParamsData()
                this.editDialogVisible = false
            })
        },
        // 删除  提示
        async removeParams(attr_id){
            const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err => err)
            if( confirmResult !== 'confirm' ){
                return this.$message.info('已取消删除！')
            }
            // 执行删除业务逻辑
            const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
            if(res.meta.status !== 200) {
                return this.$message.error('删除参数失败！')
            }
            this.$message.success('删除参数成功！')
            this.getParamsData()
        },
        // 文本框失去焦点，或摁下了Enter 都会触发
        async handleInputConfirm(row) {
            // 输入框中 若是空格时的处理
            if(row.inputValue.trim().length === 0){
                row.inputValue = ''
                row.inputVisible = false
                return
            }
            // 若是内容时的处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            this.saveAttrVals(row)
        },
        // 点击按钮， 展示文本输入框
        showInput(row) {
            row.inputVisible = true
            // 让文本框自动获取焦点
            //  $nextTick 方法的作用，就是当前页面上的元素被重新渲染之后，才会指定回调函数中的代码
            this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus();
            })
        },
        // 将向数据库更新数据的函数提取出来
        async saveAttrVals(row){
            // 需要发起请求
            const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
                attr_name: row.attr_name,
                attr_sel: row.attr_sel,
                attr_vals: row.attr_vals.join(' ')
            })
            if(res.meta.status !== 200) {
                return this.$message.error('修改参数项失败！')
            }
            this.$message.success('修改参数项成功！')
        },
        // 删除
        async handleClose(i,row){
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)
        }
    },
    computed: {   //这里边主要是计算函数
        // 如果按钮需要被禁用，则返回true,否则返回false
        isBtnDisabled() {
            if(this.selectedCatKeys.length !== 3) {
                return true
            }
            return false
        },
        // 当前选中的三级分类的Id
        cateId() {
            if(this.selectedCatKeys.length === 3) {
                return this.selectedCatKeys[2]
            }
            return null
        },
        titleText() {
            if(this.activeName === 'many'){
                return '动态参数'
            }
            return '静态属性'
        }
    }
}
</script>
<style lang="less" scoped>
.cat_opt{
    margin: 15px 0;
}
.el-tag{
    margin: 10px;
}
.input-new-tag {
    width: 120px;
}
</style>